Mount & Blade II: Bannerlord stopped launching after a mod update — clean test method?

Mount & Blade II: Bannerlord stopped launching after adding or updating mods. Removing one random mod at a time is getting nowhere.

What is the fastest clean test for load order, outdated dependencies, config leftovers, and save compatibility? The game-specific areas are mod load order, save compatibility, siege CPU load, and campaign stutter.

Build a clean-room test instead of random removal.

1. Back up saves and the entire mod list.
2. Disable every mod and confirm vanilla Mount & Blade II: Bannerlord reaches the menu.
3. Re-enable required frameworks first.
4. Add mods back in small groups, newest or recently updated groups first.
5. Delete only generated mod caches or configs documented by the mod author.
6. Check game version, dependency version, and load order together.

For Mount & Blade II: Bannerlord, focus on mod load order, save compatibility, siege CPU load, and campaign stutter. If vanilla also crashes, stop blaming the mods and verify the base game.